Smoke-consuming furnace.



No. 727,410. I IYPATENTED MAY 5, 1903. J. A; MoALLISTERL SMOKE GONSUMING FURNACE. APPLICATION FILED arm. 15. 1902.

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J. A. MoALLISTER. SMOKE CONSUMING FURNACE.

APPLIOATION FILED SEPT. 15, 1902.

I0 MODEL.

PATENTED MAY 5, 1903.

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1%. 727,410. Patented May 5, 1903.

lINitnp Tarps ATENT FFICE.

JAMES A. MCALLISTER, OF INDIANAPOLIS, INDIANA, ASSIGNOR OF FIFTY-ONE ONE-I-IUNDREDTHS TO ROBERT O. FINOH, OF INDIANAPOLIS, INDIANA.

SMOKE-CONSUMING FURNACE.

SPECIFICATION forming part of Letters Patent No. 727,410, dated May 5, 1903. Application filed September 15, 1902. eria]. No. 123,478. (No model.)

.To aZZ whom it may concern: 15, with a front wall 16 below the same, a Be it known thatl, JAMES A. MCALLISTER, bridge-wall 17, the back stand 18, and the of Indianapolis, county of Marion, and State back wall 19. The boiler is of a common of Indiana, have invented a certain new and type,with a series of tlues in it, through which useful Smoke-Consuming Furnace; and I do the heat passes from the rear to the front into hereby declare that the following is a full, the breeching 20, from which a pipe 21 leads clear, and exact description thereof, reference to the smoke-stack 22. The furnace-chamber being had to the accompanying drawings, in is located between the walls 16 and 17, and which like numerals refer to like parts. there is a ledge at 23 in the opposing faces of 10 This invention relates to improvements in said walls, upon which the bearing-bars 24 the smoke-consuming furnace shown in apare secured. -The unconsumed smoke is plication filed by me on November 21, 1901, brought back from the smoke-stack through Serial No. 83,11 the return-pipe 40, as seen in Fig. 1, that One feature of theinvention consists in propasses through the front wall and enters the I5 viding a single conveniently-located means ash-pit below the grate-bars. An air-mixer for operating all of the dampers, and which 41 is provided at the inlet end of the pipe 40, means holds the door leading to the live fire to cause air to enter and mix with the smoke. closed, so that only the door leading to the Thepipes 40 lead from the transverse pipe 42, fire needing to be replenished with fuel can that comes from the fan 43, mounted on the 20 be opened. stand 1 1 and driven by the belt 415. Said fan Another feature of the invention consists 43 is fed by pipe 46,that leads from the smokein providing a cold water spray through stack above the pipes 21, that enter it from which the smoke passes in its second movethe breeching of the boilers, whereby the ment from the furnace toward the smokesmoke is drawn from the smoke-stack and re- 25 stack, which washes the black particles out turned beneath the grate-bars. of the smoke, so that only the clean uncon- As in my former application, I here pro sumed gases will pass through the smokevide abattery of boilersand furnaces, two hestack. ing shown, although one furnace may be used The full nature of the invention will be unif it is divided into two furnace-chambers.

3o derstood from the accompanying drawings The fan will draw the smoke out of the and the following description and claims. smoke-stack without a damper being placed In the drawings, Figure 1 is-a longitudinal above the pipe 46. However, dampers 65 are vertical section to one side of the center of 2. provided in the pipes 21 and are actuated by furnace and boiler with the boiler and pipes the wheels 48, whereby one of said pipes 21 35 shown in elevation and containing a watermay be opened'while the other is closed. A spray in central vertical section and with the pipe 50 leads from each pipe 21 at a point upper end of the smoke-stack broken away. preceding the damper or valve operated by Fig. 2 is a front elevation of a furnace and the handle. 48 to the spray-chamber 51. This boiler containing my improvements with chamber is a vertical one mounted on the 0 parts broken away, as shown. Figs. and 4 block 52, that is supported on the timbers 52 0 are detail Views of the valve or damper for on a higher level than the boilers. The pipes regulating the entrance to the furnace-cham- 50 under the spray-chamber at its lower end, her of the returned smoke. Figs. 5 and 6 are and a pipe 54: leads from the upper end of detail sectional views of the damper for regusaid chamber to the smoke-stack. At the up- 5 lating the movement of the current through per end of the spray-chamber a spray-head 5 the smoke-stack. Fig. 7 is a detail sectional 55 is mounted and is fed from the water-pipe view of the means for controlling the admis 56, that leads from anysuitable source of supsion of returning smoke to the furnace-ehamply. Said spray-chamber is provided with a bers. drain-pipe 57.

50 As appears in Fig.1,tl1ere is shownaboiler The pipes 40, through which the return smoke enters the furnace below the gratebars, are controlled by dampers 60. (Seen in Figs. 11 and 12.)

The operation is as follows: Assuming the furnace-chamber to be clean, the coal or fuel is supplied and a fire started in one furnace. For this beginning fire the outlet through the smoke-stack would have to be kept clear until steam is gotten up and the fire is under way, as has been the custom heretofore. After this start, however, the two furnaces are fired alternately. When one furnace is fired, the other has a live fire in it, so that the damper is closed that leads to the furnace being fired, while the other damper 60 is opened so that the return smoke will pass through the live fire while the other furnace is being fired. In such case the passage-way from the green fire to the smokestack will be kept clear and open, so that the smoke will be drawn by the fan from the smoke-stack through the pipe 46 and forced beneath the live fire. While that is being done the passage-way from the live fire to the lower end of the smoke-stack is closed by the damper actuated by the handle 48, so that from the live fire the smoke does not directly enter the smoke-stack, but, in the first place, enters the spray-chamber 51 and passes therethrough and through the pipe 54 to the smoke-stack above. This smoke from the live fire has little, if any, unconsumed matter in it, and what unconsumed matter there may beinitmaybewashedoutof thesmokethrough the spray and carried down through the wastepipe, so that clean smoke or mere gases will pass out of the smoke-stack. By alternate firing and shifting the dampers, as explained, it is observed that no smoke from the green fire passes out of the smoke-stack, but always returns through the live fire, and the only smoke that passes out of the smoke-stack comes from the live fire, and even it is cleaned by having passed through the spray-chamber. The dampers 60 and are actuated simultaneously, the dampers on one side of the furnace being closed when the others are opened by means of the chain 66, that runs over the sprocket-wheels 48 and past the pulleys 67 over the sprocket-wheels 68. The chain 66 is actuated by the lever 69, which is pivoted at 70 to the front of the furnace. Said lever is connected with the chain by the block 71, which has secured to it a laterally-movable bar 72, with its ends passing through brackets 73 near the furnace-doors on each side. The length of the bar 73 is such that when the lever is turned in one direction for actuating the chain 66 and the dampers the door of one furnace will be closed and the other opened, and when said lever is reversed the opposite efiect will be produced on the doors of the furnace.

To the lower end of the lever 69 there is pivoted ahorizontal bar 74, which actuates the two dampers 60 in the pipe 40 through the crank 75 on the stems of said valves.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. Inafurnace,apluralityoffurnace-chambers, a smoke-stack, a conduit from each furnace-chamber to the smoke-stack, means for returning the smoke from the smoke-stack to the furnace-chambers, a damper for regulating the return of the smoke to each furnacechamber, a spray-chamber, a pipe leading to the spray-chamber from each conduit entering the smoke-stack, a'damper in each of such conduits between the smoke-stack and pipes leading to the spray-chamber,and a pipe leading from the spray-chamber to the smokestack.

2. Ina furnace,aplurality offurnace-chambers, a smoke-stack, a conduit from each furnace-chamber to the smoke-stack, means for returning the smoke from the smoke-stack to the furnace-chambers, dampers for regulating the return of the smoke to each furnacechamber, doors leading to the furnace-chambers, means for alternately locking the doors to said furnace-chambers, and a single means for actuating said dampers and the door-locking means.

3. Inafurnace,apluralityof furnace-chambers, a smoke-stack, a conduit from each furnace-chamber to the smoke-stack, a damper in each of said conduits, a conduit leading from the smoke-stack divided into branches with one branch leading to each furnacechamber, means for returning the smoke therethrough, a damper in each branch of the return conduit that leads to the furnacechambers, and a single means for actuating all of said dampers so as to open the damper in the one conduit leading to the smoke-stack and the branch conduit leading to the oppositely-located furnace-chamber and to close the other dampers.

In witness whereof I have hereunto affixed my signature in the presence of the witnesses herein named.

, JAMES A. MCALLIS'IER.

Witnesses:

NELLIE ALLEMONG, F. W. WOERNER. 

